Strain-Based Confinement Model for FRP-Confined Concrete
Publication: Journal of Structural Engineering
Volume 133, Issue 6
Abstract
A constitutive strain-based confinement model is developed for circular concrete columns confined with external fiber-reinforced polymer (FRP) composite jackets. The model includes the properties of the concrete microstructure through a series of relationships developed from experimental data and the fundamental stress-strain behavior of concrete. The secant concrete modulus was used in the model and expressed as a function of the secant modulus softening rate. In addition, the ultimate radial strain was related to the FRP composite effectiveness. The distinguishing feature of the model is that it includes the effects of FRP confinement on the concrete microstructure by evaluating the internal concrete damage using the axial, radial, and volumetric strains. The FRP-confined concrete model predicts the axial stress at any level of axial strain accurately for any normalized effective confinement stiffness of the FRP composite jacket as verified in comparisons with experiments.
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Acknowledgments
The writers acknowledge the financial support of the National Science Foundation under Grant No. NSFCMS 0099792. The writers acknowledge Sika Corporation; Air Logistics Corporation and Eagle Precast Inc. for in-kind support; they also acknowledge the assistance of Professor Lawrence D. Reaveley and that of several graduate students at the University of Utah.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 6 • June 2007
Pages: 825 - 833
Copyright
© 2007 ASCE.
History
Received: Nov 14, 2005
Accepted: Nov 13, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Jin-Guang Teng
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